Hardly any difference in pharm grade. I've tried different brands and never noticed a difference, dont remember trying pfizer though.
Could be food intake, sleep etc
Without blood work hard to say
What difference do you feel..just curious

I've been on Pfizer and now another brand that I don't have in front of me, but I have not noticed any difference. I seem to get a different brand every couple months, so I'm glad that I have noticed anything!

Were you using the entire 1ml Pfizer at one injection. What I am getting at is that you may be drawing less than you think from the 10ml vial depending upon how you read the metered syringe. Where as before you just emptied the entire 1ml into your syringe. Just speculating as I don't know how many ml you inject at once.

Look at all these little kids takin' care of the music biz don't their bus'ness take good care of me...